4 ms·

It was a find_iter() across \w+. There was other surrounding code that might have affect the output (it emitted (String, position pairs). I will try to isolate

• burntsushi 10y ago
  Thanks! If you come up with an example I'd love to see it. Generally, even though `\w` in Rust's regex library supports Unicode, it shouldn't result in a slow-down compared with the non-Unicode `\w`, assuming you're using find_iter. (Of course, Unicode support isn't free, but the primary cost here is memory and compile time, not matching performance.) If you were indeed emitting `String` (a new allocation for every match) instead of `&str`, then that could certainly be a possible explanation for the slow down.